1
open System
open Mono.Cecil
open Mono.Cecil.Cil
let myHelloWorldApp =
AssemblyDefinition.CreateAssembly(
new AssemblyNameDefinition("HelloWorld", new Version(1, 0, 0, 0)), "HelloWorld", ModuleKind.Console)
let module_ = myHelloWorldApp.MainModule
// create the program type and add it to the module
let programType =
new TypeDefinition("HelloWorld", "Program",
Mono.Cecil.TypeAttributes.Class ||| Mono.Cecil.TypeAttributes.Public, module_.TypeSystem.Object)
module_.Types.Add(programType)
// add an empty constructor
let ctor =
new MethodDefinition(".ctor", Mono.Cecil.MethodAttributes.Public ||| Mono.Cecil.MethodAttributes.HideBySig
||| Mono.Cecil.MethodAttributes.SpecialName ||| Mono.Cecil.MethodAttributes.RTSpecialName, module_.TypeSystem.Void)
// create the constructor's method body
let il = ctor.Body.GetILProcessor()
il.Append(il.Create(OpCodes.Ldarg_0))
// call the base constructor
il.Append(il.Create(OpCodes.Call, module_.ImportReference(typeof<obj>.GetConstructor([||]))))
il.Append(il.Create(OpCodes.Nop))
il.Append(il.Create(OpCodes.Ret))
programType.Methods.Add(ctor)
// define the 'Main' method and add it to 'Program'
let mainMethod =
new MethodDefinition("Main",
Mono.Cecil.MethodAttributes.Public ||| Mono.Cecil.MethodAttributes.Static, module_.TypeSystem.Void)
programType.Methods.Add(mainMethod)
// add the 'args' parameter
let argsParameter =
new ParameterDefinition("args",
Mono.Cecil.ParameterAttributes.None, module_.ImportReference(typeof<string[]>))
mainMethod.Parameters.Add(argsParameter);
// create the method body
il = mainMethod.Body.GetILProcessor()
il.Append(il.Create(OpCodes.Nop))
il.Append(il.Create(OpCodes.Ldstr, "Hello World"))
let writeLineMethod =
il.Create(OpCodes.Call,
module_.ImportReference(typeof<Console>.GetMethod("WriteLine", [|typeof<string>|])))
// call the method
il.Append(writeLineMethod)
il.Append(il.Create(OpCodes.Nop))
il.Append(il.Create(OpCodes.Ret))
// set the entry point and save the module
myHelloWorldApp.EntryPoint <- mainMethod
我向這個問題的答案借了the example,並用F#重寫了它。當我嘗試運行它,我得到以下錯誤:爲什麼Mono.Cecil HelloWorld示例失敗並出現異常?
Unhandled Exception: System.TypeLoadException: Could not load type 'HelloWorld.Program' from assembly 'Hello
on=1.0.0.0, Culture=neutral, PublicKeyToken=null' because the method 'Main' has no implementation (no RVA).
這裏有什麼問題?
是啊,這是它。儘管不是使用let語句,但最好將它綁定到lambda,否則會發生重複的變量錯誤。另外,我之前已經注意到,由於某種原因,F#沒有給我通常的平等測試沒有單位警告,但是我沒有再次檢查相同的錯誤。謝謝。 –
@MarkoGrdinic您不會在腳本的頂層獲得平等測試警告(您可能需要編寫大量表達式並逐個運行它們)。如果你的代碼是在一個函數內部的話,你會得到那些(反正這是一個更好的結構) –